Wich gearbox to use?

[Mathias]

Hi there! I´m looking for answers regarding wich gearbox to use in my 03. I drive a type 4, 2,5 litre, aprox 160bhp. Up to now I´we been using the original wich works fine for race, but a longer fourth or a fifth would be nice on the highway. I´we got the tip on using a 912 gearbox, wich cars used ths?

Thanx in advance

[euro1303]

porsche 912?

[Mathias]

Yes Porsche 912. Hard to find here in sweden...
Seen some 915 been used, maybee a better idea?

[wrenchnride247]

You are looking for a 912E (to be exact). This is a rare car (basically a 911 with T4 motor). The tranny is geared for the T4, but is a 915 tranny. Jake Raby has a daily driver 912E, and a extra tranny he is going to use for a future T1 GL project. www.aircooledtechnology.com

To get the tranny in the T1 bug@5speed is a good way to go.

[Bugat5speed]

Hi Mathias,

the 912-gearbox is not the best gearbox to recommend in your special case. In the 912 a type 901 gearbox with short ratios was installed. It was no 915. For the type 4 engine that you have I would recommend a 914-gearbox. Their ratios are much longer and they fit perfectly to huge type 4s.
A 915 is not necessary. The 914s stand upto 270 Nm easily and are much cheaper and easier to get than 915. Besides 915 are about 52-55 kg in weight, a 914 is about 42 kg.

If you´ve got more questions, please contact me by mail to
info@bugat5speed.de, or have a look on my site www.bugat5speed.de

Cheers

Martin Bott

[petevw]

Originally Posted by Bugat5speed

Hi Mathias,

the 912-gearbox is not the best gearbox to recommend in your special case. In the 912 a type 901 gearbox with short ratios was installed. It was no 915.

The 912E had the 923 transmission. Basically a 915 close ratio 5speed (for the 4cyl) with a 901 bellhousing (to bolt up to 2L type4) and i believe T2 output shafts. Only 2000? were made.

[Mathias]

OK thanks for the info.

Martin: I will contact you soon reg. conversion kit. I will try to get ahold of a 914 tranny then. Is there different versions of this or are all 914 the same? So I know what too look for.

[Bugat5speed]

Mathias,

the best gearbox for a conversion is the pre ´72 version with the shift mechanism at the nose cone (mainly 914 1.7). For this gearbox you do not need to buy different inside shift rods. The later 914 needs the 3 shiftrods inside plus the side cover where now the shift mechanism is placed. These parts easliy cost 200 Euro as used parts. So, if you´ve got the choice....
There is no or no real difference in ratios on the 2 types of 914. The only one that differs completely is the 914/6. This has shorter ratios which are similiar to the ones of the 901-gearbox. But on the other hand it is so, that those who own such a gearbox won´t give it away or would ask for much more money than for a 914/4-one. So, don´t worry about this!

Looking forward to your mail

Martin Bott

[Mathias]

OK, thanx! I found a guy who has a 914 tranny for sale and will check if he knows when it´s produced.

I´ll bee back...

[Wally]

Originally Posted by Bugat5speed

A 915 is not necessary. The 914s stand upto 270 Nm easily and are much cheaper and easier to get than 915. Besides 915 are about 52-55 kg in weight, a 914 is about 42 kg.

Martin Bott

My 915 is an early mag-cased one and weighs in at 44.3 kg

[Bugat5speed]

@Wally,

yes you´re right. The mg-case is not that heavy. But on the other hand I do not see a front or rear mount on the gearbox (-:

The 42 kgs for the 914 are already with thes parts.

But why pay for a 915 when the 901/914 is sufficient. Parts are still more expensive also.

But any way Mathias, whatever you decide to mount in, I can help you with parts if you like.

Martin

[Wally]

Originally Posted by Bugat5speed

@Wally,

yes you´re right. The mg-case is not that heavy. But on the other hand I do not see a front or rear mount on the gearbox (-:

That is true. That is measured without rear mount. Front mount is more a car part as I see it ;-)

But why pay for a 915 when the 901/914 is sufficient. Parts are still more expensive also.

Martin

Because I really do have more than 270 Nm, which you noted as the limit on a 901/914 and I agree that the 901/914 is borderline for really strong engines.
If you start breaking stuff, what is more expensive...?

Greets,
Walter

[Sandeep]

My 914 box is still holding together ... no funny noises until I hit 13 psi so I have to be careful .... which is no fun. I hope the box holds together for 1 more year until I can fund a 915 conversion.

Sandeep